Geometry

Question Analysis

This question involves the concept of supplementary angles.

 

Key Concept Explanation

Supplementary angles are two angles whose sum equals 180°. When two angles form a straight - line (a linear pair), they are supplementary.

 

Step-by-Step Solution

1. Let the measure of the missing angle be .

2. We know that one angle is 101°.

3. Since the two angles form a linear pair, we can establish the equation .

4. To find , we subtract 101° from both sides of the equation: .

 

Option Analysis

A.89°: Incorrect. The sum of 89° and 101° is

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